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Multiplying Squares Using Associative Property

What is the s...

Question

What is the sum of 5th and 6th triangular number?

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Solution

Sum of two consecutive triangular numbers is a perfect square.
Hence the sum of 5th and 6th tiangular number is equal to $6^{2}$ = 36

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Multiplying Squares Using Associative Property

Standard VII Mathematics

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